The 220kV Solid Core Post Insulator of 2300 mm Height is used for EHV Sub-stations in 400KV and above category. Modern Insulators Ltd. Manufactures 220kV Solid Core Post Insulator of 2300 mm Height. Modern Insulators Ltd. Is an ISO 9001:2000 and 14001:2004 registered company, that offers Textile and High Voltage Porcelain Insulators range of 33KV to 765 KV.